% a = [1,2,3];
% b = [2,4,3];
% c = a./b;       % 子元素相除
% d = b./a;       % 子元素相除,后除前
% e = a/b;        % e * b = a  的近似解 
% f = a\b;        % e * a = b  的近似解


% mode = [4,1,-1;3,2,-6;1,-5,3];
% inv(mode)
% [tmp1,tmp2] = eig(mode)
% a * x = b  x = b / a
m1 = [2,1,-1,1;
    1,2,1,-1;
    1,1,2,1];
m2 = [1;2;3];
ret = m2\m1;